US8772683B2 - Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve - Google Patents
Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve Download PDFInfo
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- US8772683B2 US8772683B2 US12/878,774 US87877410A US8772683B2 US 8772683 B2 US8772683 B2 US 8772683B2 US 87877410 A US87877410 A US 87877410A US 8772683 B2 US8772683 B2 US 8772683B2
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- conductive
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/46—Dielectric heating
- H05B6/62—Apparatus for specific applications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
- H05B2214/03—Heating of hydrocarbons
Definitions
- the invention concerns heating of hydrocarbon materials in geological subsurface formations by radio frequency electromagnetic waves (RF), and more particularly, this invention provides a method and apparatus for heating hydrocarbon materials in geological formations by RF energy emitted by well casings that are coupled to an RF energy source.
- RF radio frequency electromagnetic waves
- Hydrocarbon materials that are too thick to flow for extraction from geologic deposits are often referred to as heavy oil, extra heavy oil and bitumen. These materials include oil sands deposits, shale deposits and carbonate deposits. Many of these deposits are typically found as naturally occurring mixtures of sand or clay and dense and viscous petroleum. Recently, due to depletion of the world's oil reserves, higher oil prices, and increases in demand, efforts have been made to extract and refine these types of petroleum ore as an alternative petroleum source.
- heavy oil, extra heavy oil and bitumen are typically extracted by strip mining of deposits that are near the surface.
- the deposits are heated so that hydrocarbon materials will flow for separation from other geologic materials and for extraction through the well.
- solvents are combined with hydrocarbon deposits so that the mixture can be pumped from the well. Heating with steam and use of solvents introduces material that must be subsequently removed from the extracted material thereby complicating and increasing the cost of extraction of hydrocarbons.
- Prior systems for heating subsurface heavy oil bearing formations by RF have generally relied on specially constructed and complex RF emitting structures that are positioned within a well.
- Prior RF heating of subsurface formations has typically been vertical dipole antennas that require specially constructed wells to transmit RF energy to the location at which that energy is emitted to surrounding hydrocarbon deposits.
- U.S. Pat. Nos. 4,140,179 and 4,508,168 disclose such prior dipole antennas positioned within vertical wells in subsurface deposits to heat those deposits. Arrays of dipole antennas have been used to heat subsurface formations.
- 4,196,329 discloses an array of dipole antennas that are driven out of phase to heat a subsurface formation.
- Prior systems for heating subsurface heavy oil bearing formations by RF energy have generally relied on specially constructed and complex RF emitting structures that are positioned within a well.
- An aspect of the invention concerns an apparatus for heating a geologic deposit of material that is susceptible to heating by RF energy.
- the apparatus includes a source of RF power and a well structure that provides a closed electrical circuit to drive RF energy into the well.
- Another aspect of the invention concerns heating a geologic deposit of material that is susceptible to heating by RF energy by an apparatus that is adapted to a well structure.
- Yet another aspect of the invention concerns an apparatus for heating a geologic deposit of material that is susceptible to heating by RF energy that adapts conventional well configurations for transmission and radiation of RF energy.
- FIG. 1 illustrates an apparatus according to the present invention for emitting RF energy into a geologic hydrocarbon deposit.
- FIG. 2 illustrates the current conducted by the apparatus shown by FIG. 1 .
- FIG. 3 illustrates heating of material surrounding the apparatus shown by FIG. 1 by specific absorption rate of the material.
- FIG. 4 illustrates an apparatus according to the present invention for emitting RF energy into a geologic hydrocarbon deposit having an apparatus that transmits RF energy to a structure that heats surrounding material by emitting RF energy.
- FIG. 5 illustrates a cross section of a region of the apparatus of FIG. 4 at which the apparatus transitions from transmission of RF energy to emission of RF energy.
- FIG. 6 illustrates a mixture of concrete and iron particles surrounding the transmission section of the apparatus of FIG. 4 .
- FIG. 7 illustrates the relationship between particle size and frequency to avoid inducing current in the particle.
- FIG. 1 illustrates an apparatus 10 according to the present invention for driving an RF current in a well structure 12 .
- the apparatus 10 includes an RF current source 14 that is coupled to the well structure 12 at two locations to create a circuit through the well structure.
- the well structure includes a bore pipe 16 of conductive material that extends into a geological formation through a surface 34 .
- An electrically conductive sleeve 18 surrounds a section of the bore pipe 16 from the surface 34 to a location 22 along the length of the bore pipe 16 .
- a conductive annular plate 26 extends from the bore pipe 16 to the sleeve 18 and is in conductive contact with both the pipe 16 and the sleeve 18 .
- the well structure 12 is shown entirely vertical. It is understood however that well structure 12 may also be a bent well, such as a horizontal directional drilling (HOD) well. HOD wells can immerse antennas for long lengths in horizontally planar hydrocarbon ore strata.
- HOD horizontal directional drilling
- FIG. 2 illustrates the paths of RF currents I on the FIG. 1 embodiment from the RF current source 14 through the well structure 12 .
- One terminal of the current source 14 is connected to the bore pipe 16 and the other terminal of the current source 14 to the sleeve 18 above the surface 34 .
- multiple RF currents I travel on the surfaces of the bore pipe 16 and the sleeve 18 .
- the thickness of the wall forming sleeve 18 is multiple radio frequency skin depths thick so electrical currents may flow in opposite directions on the inside of sleeve 18 and on the outside of bore pipe 16 .
- the well-antenna structure may comprise an end fed dipole antenna with an internal coaxial fold which provides an electrical driving discontinuity and a parallel resonating inductance from the internal coaxial stub.
- FIG. 3 depicts example heating contours 90 for the well 12 . More specifically FIG. 3 shows the rate of heat application as the Specific Absorption Rate (SAR). SAR is a measure of the rate at which energy is absorbed by the underground materials when exposed to radio frequency electromagnetic fields. Thus FIG. 3 has parameters of power absorbed per power mass of material and the units are watts per kilogram (W/kg).
- SAR Specific Absorption Rate
- the realized temperatures are a function of the duration of the heating in days and the applied power level in watts so most underground temperatures may be accomplished by the well 12 .
- one (1) watt was applied to the well 12 at a frequency of 0.5 MHz.
- the FIG. 3 embodiment is shown without an upper transmission line section, although one may be included if so desired.
- the heating of the embodiment starts at the surface 34 which may preferential for say environmental remediation of spilled materials near the surface such as gasoline or methyl tertiary butyl ether (MTBE).
- MTBE methyl tertiary butyl ether
- a steam saturation zone can be formed along the well structure 12 and the realized temperatures limit along the well allowed to regulate at the boiling temperatures of the in situ water. This may range in practice from 100° C. at the surface to say 300° C. at depths.
- the steam saturation zone grows longitudinally over time along the well and radially outward from the well over time extending the heating.
- There realized temperatures underground depend on the rate of heat application, which is the applied RF power in watts and the duration of the application RF power in days.
- Liquid water heats in the presence of RF electromagnetic fields so it is a RF heating susceptor. Water vapor is not a RF heating susceptor so the heating stops in regions where there is only steam and no liquid water is present.
- the steam saturation temperature is maintained in these nearby regions since when the water condenses to liquid phase it is reheated to steam.
- a low temperature extraction method of the present invention will now be described.
- the well structure 12 does not heat the underground resource to the steam saturation temperature (boiling point) of the in situ water, say to assist in hydrocarbon mobility in the reservoir.
- the technique of the method is to limit the rate of RF power application, e.g. the transmitter power in watts, and to allow the heat to propagate by conduction, convection or otherwise such that the realized temperatures in the hydrocarbon ore do not reach the boiling temperature of the in situ water.
- the method is production of oil and water simultaneously at temperatures below the boiling point of the water such that the sand grains do not become coated with oil underground.
- the hydrocarbons that are to be extracted are located in regions that are separated from the surface. For such formations, heating of overburden geologic material surrounding a well structure near the surface is unnecessary and inefficient.
- FIG. 4 illustrates an apparatus 40 according to the invention for driving an RF current in a well structure 42 to heat geologic formations that are separated from the geological surface.
- the apparatus 40 includes an RF current source 14 that drives an RF current in the well structure 42 that extends into a geologic formation from a surface 34 .
- the well structure 42 includes a transmission section 46 that extends along the well structure 42 from the surface 34 of the geological formation.
- the well structure also includes a transition section 48 that extends along the well structure 42 from the transmission section 46 , and a radiation section 52 that extends along the well structure 42 from the transition section 48 .
- the transmission section 46 of the well structure 42 has a bore pipe 56 that extends along the well structure 42 from an upper end 57 to the transition section 48 .
- a sleeve 58 surrounds the bore pipe 56 and extends along the bore pipe 56 from an upper end 59 to the transition section 48 .
- the RF current source 14 connects to the bore pipe 56 and to the sleeve 58 .
- the well structure 42 provides a circuit for RF current to flow as described below.
- the bore pipe 56 is joined to a second bore pipe 66 and the sleeve 58 is joined to a second sleeve 78 that surrounds the second bore pipe 66 and extends along the second bore pipe 66 from the transition section 48 .
- the connections at the transition section 48 are indicated schematically in FIG. 4 , and are physically depicted in FIG. 5 .
- the second bore pipe 66 extends from the transition section 48 through the radiation section 52 to a lower end 68 .
- a second sleeve 78 extends from the transition section 48 into the radiation section 52 around and along the second bore pipe to a location 82 that is between the transition section 48 and the lower end 68 of the bore pipe 66 .
- the second sleeve 78 is conductively connected to the second bore pipe 66 . This connection may be by annular plate 26 or other conductive connection.
- FIG. 5 shows the cross section of the transition section 48 .
- the bore pipe 56 ends at the transition section 48 with an externally threaded end 55 .
- the bore pipe 66 has an externally threaded end 65 at the transition section 48 .
- a nonconductive sleeve 102 is positioned between the externally threaded ends 55 and 65 of the bore pipes 56 and 66 , respectively.
- the sleeve 102 has internally threaded ends 102 and 105 that engage the externally threaded ends 55 and 65 , respectively, of the bore pipes 56 and 66 , respectively.
- the sleeve 58 ends at the transition section 48 with an externally threaded end 61 and the sleeve 78 has an externally threaded end 81 at the transition section 48 .
- a nonconductive sleeve 104 is positioned between the externally threaded ends 61 and 81 of the bore sleeves 58 and 78 , respectively.
- the sleeve 104 has internally threaded ends 107 and 109 that engage the externally threaded ends 61 and 81 , respectively, of the sleeves 58 and 78 , respectively.
- a conductor 112 is fastened to and provides a conductive path between the sleeve 58 and the bore pipe 66 .
- a conductor 114 is fastened to and provides a conductive path between the bore pipe 56 and the sleeve 78 .
- transmission section 52 is configured and is driven by an RF current as is the well structure 12 .
- a jacket 62 surrounds the sleeve 59 of the transmission section 46 .
- the jacket 62 limits RF energy loss to the surrounding geologic material.
- FIG. 6 shows a partial cross section of the jacket 62 .
- the jacket 62 is comprised of portland cement with iron particles 63 dispersed throughout.
- the iron particles 63 may have a passivation coating 64 on their exterior.
- the passivation coating 64 may be created by parkerizing by a phosphoric acid wash.
- the outer dimension of the iron particles is kept below a minimum dimension to prevent skin effect eddy currents from being induced by the RF energy that is conducted adjacent to the jacket 62 . As indicated by FIG.
- the outer dimension is less than ⁇ square root over ( ⁇ c) ⁇ where ⁇ is the free space wavelength in meters, ⁇ is the electrical conductivity of the iron in mhos or siemens, ⁇ is the magnetic permeability on henries per meter and c is the speed of light in meters per second.
- FIG. 7 shows the diameter of particles 63 for both carbon steel and silicon steel particles for frequency between 10 Hz and 10,000 HZ.
- the well structure 42 as shown by FIG. 4 will create a heating pattern as shown by FIG. 3 that is adjacent to the transmission region 52 .
- the location of that heating region can be specified by the length of the transmission region so that the region of RF heating is at a desired depth below the surface.
- the present invention is capable of electromagnetic near field heating.
- near field antenna operation in dissipative media the field penetration is determined both by expansion spreading and by the dissipation.
- Field expansion alone provides for a 1/r 2 rolloff of electromagnetic energy radially from the well axis.
- Dissipation can provide a much steeper gradient in heating applications and between 1/r 5 and 1/r 7 are typical for oil sands, the steeper gradient being typical of the leaner, more conductive ores.
- the RF skin depth is exact for far fields/the penetration of radio waves and approximate for near fields.
- a steam saturation zone may grow along the present invention antenna and this spreads the depth of the heating over time to that desired as the fields can expand in the low loss volume of the steam bubble to reach the bubble wall where the in situ liquid water is in the unheated ore and the heating can be concentrated there.
- the steam bubble around the antenna may comprise a region primarily composed of water vapor, sand, and some residual hydrocarbons.
- the electrically conductivity and imaginary component dielectric permittivity are relatively low in the steam bubble saturation zone so electromagnetic energy can pass through it without significant dissipation.
Abstract
Description
Claims (27)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/878,774 US8772683B2 (en) | 2010-09-09 | 2010-09-09 | Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve |
PCT/US2011/050299 WO2012033712A2 (en) | 2010-09-09 | 2011-09-02 | Apparatus and method for heating of hydrocarbon deposits by rf driven coaxial sleeve |
CA2810517A CA2810517C (en) | 2010-09-09 | 2011-09-02 | Apparatus and method for heating of hydrocarbon deposits by rf driven coaxial sleeve |
AU2011299367A AU2011299367A1 (en) | 2010-09-09 | 2011-09-02 | Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/878,774 US8772683B2 (en) | 2010-09-09 | 2010-09-09 | Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve |
Publications (2)
Publication Number | Publication Date |
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US20120061380A1 US20120061380A1 (en) | 2012-03-15 |
US8772683B2 true US8772683B2 (en) | 2014-07-08 |
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US12/878,774 Active 2032-03-11 US8772683B2 (en) | 2010-09-09 | 2010-09-09 | Apparatus and method for heating of hydrocarbon deposits by RF driven coaxial sleeve |
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Country | Link |
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US (1) | US8772683B2 (en) |
AU (1) | AU2011299367A1 (en) |
CA (1) | CA2810517C (en) |
WO (1) | WO2012033712A2 (en) |
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US10760392B2 (en) | 2016-04-13 | 2020-09-01 | Acceleware Ltd. | Apparatus and methods for electromagnetic heating of hydrocarbon formations |
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US20120061380A1 (en) | 2012-03-15 |
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